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<br /> <br />contaminant levels in the water quality tables. In the case of the <br />Woods vein analyses, Ag, As, Cd, Sb and Zn will need to be re- <br />analyzed with chemical methods with a much lower detection limit. <br />In addition, a separate sample must be analyzed for Mercury (Hg). <br />In the case of the Mule vein analyses, the same comments for these <br />analytical results applies as those for the Woods vein material. <br />However, it looks as though the reported heads and tails results <br />may have been reversed by the lab. The tails analyses show much <br />higher levels of metals than the heads. <br />The Division must examine the additional analytical results and <br />provide you with a letter of approval before any ore can be shipped <br />to the mill. <br />Chemical Analysis of the Tailings in the Impoundment <br />The elements Ag, As, Cd, Sb and Zn will need to be re-analyzed by <br />methods using lower detection limits consistent with water quality <br />standards. It is also noteworthy that significant amounts of Pb <br />(300 ppm), V (1500 ppm), Cr (200 ppm) and Ba (3000 ppm) are <br />contained in the tailings in the impoundment. This makes it <br />imperative that quarterly water monitoring samples are collected <br />from all monitoring wells on site and the results forwarded to the <br />Divsion within 5 days of receipt. <br />If you should have any questions about this letter, please contact <br />me. <br />SincAfely, ~ <br />William C. Yor -Feirn <br />Environmental Protection Specialist <br />cc: Gwen Fraser, Colina Oro Molino, Inc. <br />Mark Steen, Mi Vida Enterprises, Inc. <br />Bob Mason, Town of Gold Hill <br />Mark Sprague, Boulder County Land Use <br />Carl Mount, Division of Minerals of Geology <br />c:\wp51\goldhill.che <br />